.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(135deg, #7d9ef7 0%, #5db0ff 100%);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.header .back-btn, .header .exit-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    font-size: 16px;
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.header .back-btn:hover, .header .exit-btn:hover {
    background: rgba(255,255,255,0.3);
}

.header .title {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 1px;
}


/* 底部导航 */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 70px;
    background-color: white;
    display: flex;
    justify-content: space-around;
    align-items: center;
    border-top: 1px solid #e9ecef;
    z-index: 100;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}

.footer-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 0;
    color: #868e96;
    font-size: 12px;
    flex: 1;
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-item.active {
    color: #339af0;
}

.footer-item:hover {
    color: #339af0;
}

.footer-icon {
    font-size: 20px;
    margin-bottom: 5px;
}